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This battery maintainer provides a precise maintenance mode and is safe for long and short term battery storage. This fully automatic, precision-regulated maintainer can be left on indefinitely while keeping your battery fully charged and extending its life. Features built-in ignition, polarity, over temp, and short circuit protection. One-year warranty.

Happy with this charger. Is a good trickle charger. Only thing I would add is a charge indicator light. There is a green power indicator light. Unit does not run hot and will...Read complete review

Happy with this charger. Is a good trickle charger. Only thing I would add is a charge indicator light. There is a green power indicator light. Unit does not run hot and will use for winter trickle charge of several types of boat and pwc batteries.

I own several pro-mariner products and they are good units and pro-mariner has very good customer service and tech-support.

I had one installed in my new four wheeler a few years ago. So Now I bought two more for the boat batteries one for the electric trolling motor and one for the main battery.They do keep your batteries fully charged up and ready to go in just a short time "over night" and they stop when the charge is maxed ,then come on as needed. Great for winter storage of you batteries.I got them in just a few days of my order, Great service From Overton's

I was having Problems with my battery's going dead between boating trips. After purchasing the Pro Mariner Battery Maintainer for both my Personal Watercraft and my Ski Boat, I have never had another dead battery. Less trouble means more time on the water.

The battery manufacturer (Deka) recommends "never" leaving a trickle charger on the battery over 48 hours. The specs on the product above state it can be left on batteries indefinitely. Which is correct?

Well the thing about pro mariner chargers and maintainers is one you get into the larger size units, they actually switch themselves off or maintain mode and are technically not charging the unit. I would not "always" have my battery actually charging either. I would want something that flipped off or into maintain mode.